Oil pump



FIG. 1 is a top and front perspective view of an oil pump, showing our new design, the broken-line showing of the compressor element as assembled being for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side elevational view thereof; and,

FIG. 6 is a left side elevational view thereof. 

The ornamental design for an oil pump, substantially as shown and described. 